IPC Subgroup
C21D 1/58 Oils
Introduced: September 1968
Last revised: January 2006
Full Title
General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering > characterised by the quenching agents > Oils
Classification Context
- Section:
- CHEMISTRY; METALLURGY
- Class:
- METALLURGY OF IRON
- Subclass:
- MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING